Lever system for scales or the like



MayA 14, 1929.

B. W. KING LEVER SYSTEM Fon scALEs 0R TEE LIKE Filed Aug. 7, 1926 5Sheets-Sheet INVENTOR.

A TTORNE Y.

May 14, 1929. B. w. KING 1,713,286

LEVER SYSTEH FOR SCALES OR THE LIKE Filed Aug. 7, 1926 5 Sheets-Sheet 2me fw m f A TTORNE Y.

Mayl-4,1929. Y law/.KING 1,713,286

LEYER SYSTEM FOR 'SCALES OR THE LIKE Filed Aug. 7, 1926 5 Sheets-Sheet 3INVEN TOR. erz. w may A TTORNE Y.

May 14, 1929.

B. w. KING LEVER SYSTEM FOR SCALES OR THE LIKE Aug. 7, 1926 5Sheets-Sheet 4 @.5

. INVENTOR. 25a- I/I K112i. y

ATTORNEY.

B. w. K ING LEVER SYSTEM FOR SCALES OR THE LIKE May 14, 1929.

Filed Aug. 7, 1926 5 Sheets-Sheet m mm M j m7 H INVENToR.

Eer fd. /z'ny By ATTORNEY.

Patented May 14, 1929.

UNITED srArss EBATENT OFFICE.

BERT W. KING,

DETROT, MCHIGAN, A COR-PORATON 0F MICHIGAN'.

LEVER SYSTEM FOR- SCALES OR THE LIKE.

.ippucauon elec august 7, isae. semi No. 127,729.

rl`his invention relates to weighing scales, and has to do particularlywith a system of levers for scales, and it is an object of thisinvention to provide an improved lever system which is capable ot usewith scales oi diil'erent types, such as a spring scale, a pendulumscale, or a. gravity scale.

The levers are so arranged as to provide a tour point support for theplatiiorm, a check link is done away with, a lower base for the scalesis afforded, andthe arrangement is such that it weighs the saine nomatter where the load is placed on the platform.

Thissystem of levers includes a main lever,

and a complementary lever which carry the load, and the arrangement issuch that the entire load is communicated to the main lever. Anadditional lever, which is a resistance lever, is joined to the mainlever, and one end of this lever may he connected to a suitableindicator.

The lever system is peculiar, and advantageous, in that only a slightpressuie occurs at certain of the hearings, thus insuring a particularlysmooth" action and long lite of the hearings. The' two levers whichcarry the load are so corelated and proportioned that the load platformis at all times maintained in a horizontal position.

The invention will he more clearly understood by reference to theaccompanying drawings wherein:

' Fig. 1 is a perspective view of a spring or pendulum counter scale,with which the lever system may he used.

Fig. 2 is a plan view of the lever system.

Fig. 3 is a side elevation oit the lever system with some of the coverplates for the lrniite edge and agate bearings removed.

Fig. lis a sectional view taken on line e'c-si of Fig. 2, showing someof the members in dotted lines.

Figs. 5, 6, 7, and 8 are perspective views of the complementary lever,the platform spi der, the resistance lever, and themain leverrespectively.

Fig. 9 is a diagrammatic view of the lever arrangement showing how theload is communicated to the main lever through the coinplenientarylever,and also showing the resistance lever which is connected to themain lever.

Fig. 10 is an enlarged sectional view taken on line 10-1() of Fig. 3,showing the manner in which the main lever is. connected' to the 5complementary lever.

Fig. l1 is an enlarged sectionalview on line li-ll ot Fig. 4, showingthe inverted fulcruni ot the main lever, and the stop for preventingdisengagement otth'e fulcrum bear- 60 ings.

Fig. 12 is an enlarged section taken on line 12l2 ot' Fig. `l, showingthe connection between the main lever and the resistance lever.

Fig. 13 is an enlarged section on line 13-13 65 et 3 showing thestationary fulcrum of the resistance lever, and also showing the lcniifeedge and agate hearing which connects the platform spider with one endof the main lever.

The lever system of this invention can be used with a scale, as shown inFig. 1. This scale includes a hase 1, within which the levers arehoused, a pedestal 2, and a drum El which houses an indicator Ll. Thelevers in the base are connected to the indicator, as will readily heunderstood, andthe base is 1'0- vided with an opening' so that a. loadplat orm may he connected to the lever system by means ofthe members 5.

In Figs. 5 to'S inclusive, the several levers, and the platform spiderare shown. A spider 10 has two legs 1l and l2, which are connected to amain lever 15 at points 16 and 17 (Fig. 3)'. The legs 1l and 12 areshaped so as to 85 hold agate hearings for the knife edges at the points16 and 17 on the main lever. The spider also has legs 13 andA 14. Theselegs are suspended 'from points 18 andl 19`of a complementary lever 2Ohy a link connection 20* 90 (Fig. 3). Thus, it will he seen that a loadon the spider is carried by one end of the main lever 15 and hy one endof the complementary lever 20.

The complementary lever 2() has knife edge 95 hearings 21 and 22, whichare fulcrumed on a. stationary support 23. The stationary support ismounted upon a hase plate 6. This is shown in Fig. 3, and also,diagrammatically shown, in Fig. 9. At one end, the comple- 100 which arecarried by supports Y53 and 5a.

. of the main lever is inverted,

inentaryineinber has knife vedges 24: and 25, and the main lever 15 hasa pair of knife edges 26, and this main lever is suspended from thecomplementary member by a link connection27 l(Figs. 3 and 10). Y

Refer to F igs'.` fl, 8, and 9. The inain lever is provided with knifeedges 30 and 31. rllhese Vknife edges fulcruin on inverted agatebearings 32.` and 33, these agate bearings being disposed in uprightaaand which are Vmounted upon the base plate. The uprightsV arebifurcated, as shown in Fig. l, and the bearings are held in place bycaps 86 and 3?'. Eachagate bearing'is adjustable bv means of a set screw38, which extends through the cap, there being a lock nut 39 for holdingeach bearing in position after it has been f 'lt .will be Vobserved thatthis fulcruin point I in thattheagate bearings are positionedabove theknife edges, and the knife edges press upwardly against thebearings.lVhethe parts are all connected and adjusted, there 'is Va tendeniy, onthe part ofthe inain lever, to move upwardy, andthus the knife edges areurged rtoward the agatebearings. The knife edges Contact withthe'bearingswith a'relatively light pressure which is perhaps due to thefact that the l weight of the main lever must be overcome.

Y through thepedestal.

itsy shown in Figs. 7 and 8, the resistance lever 40 is'provided withV aknife edge 55, and

y the main lever is provided with a knife edge .Y

i'nfr'llhese twolevers are connected through these knife edges by ineansof a link connection 60, which includes agate bearings 6l and 62 (Figs.4 and'12). ,Y I l Y The link connections which suspend one end of themain levers frointhe complementary lever (Figs. 2 and 10), are connectedby arod 70, Vand are thus prevented froin slipping off the knife edges.Likewise, the link coiinectionswliich suspend the spider from the point19 of the complementary lever are connected by a rod 71, so that theyare prevented from slipping off their respective'knife edges; As shownin Figs. -10to 13 inclusive,

which are details of several ofthe connections between the levers, the.agate bearings are adjustably and removably mounted by means ofsetscrews and lock nuts in a manner quite siniil'ar tothe manner inwhich the agate bean l, ingsfor "the fulcruin of theinain lever arelinount'ed.

iuSted.

The normal tendency of the main lever is to movey upwardly, so that theknife edges at the fulcruni point are urged toward the inverted agatebearings'. For safety purposes,

however, the main lever is provided with projections (Fig. 11) which maybe extensions the saine members which forin the'knife edges. Positionedimmediately below these extensionsfi' are stops 76. The extensionsandthe stops are, when'th'e parts are in normal position, spaced from aslight distance from each other, and the stops prevent displacementofthe bearing members in the case offany unusual condition. Forinstance, if the connection betweenthe resistance lever and theindicator became broken, the inain lever would drop downwar lly.V ltwould be stopped, howev r, by the stop mein"- would beV prevented,because the aino'unt V,of drop permitted is relatively slight. Y rlhevarious lever arrangements, and connections having now beendescribed'with suf# licient` detail, further reference will be made tothe 'diagrammatic showing inpFig. 9. A load on the platform, carried bythe spider,

rests directly at the point- 16 of the main lever.

The load also rests at the point 19 of the coinplementary lever and, dueto the facttha't the Vcomplementary lever'is linked to the inain leverbv the link 27 the load` or ower' exerts J Y f. 2 f. an upward rorceupon the main lever at this point. rlhus, it will be observed that thepow-V er at one end ofthe leveris downward whereas,'on the otherend ofthe lever, it is upward, as indicated by arrows, P. Thus, the loadroiithe'platforin ktends to rotate the main lever 'v bers, and displacementof the several bearings about its fulcrum point 30 and, although the'load; isdivided up and communicated to oppo-` site ends ofthe inainlever., the arrangement is such that both divisions ofthe load tend to'inove the lever' about its fuloruin point inthe saine rotativedirection. i Y j'lhe resistance offeredv by the lever' 40 is applied tothe main lever as at'GO, andthis resistance is upward, as indicated bythe arf,

row R. These combined forces tend to lift the main lever bodily, theresistance overcoming the load on one end and lifting the lever, and`the power serving to lift the opposite endsof the lever, naniely,theleft end as viewed in Fig. 9. Thus, the main. lever is urged upf-`wardly against its fulcruni point. n

rEhe lever. 15, which has, for the purpose of convenience, been termedthe inain lever, is more than a siinple lever, int-hat it combines inorethan one type of lever and is in the-nature of a teeter. That part ofthe main lever which extends from the point ofresistance to f the left,forms a lever of the first order.V The upward power is overcome by theresistance,

and the fulcruni point is between the two.

rllhat part of the main lever from the fulcruin point 30 tothe right, asviewed in Fig. 9,

forins a lever or" the second order, in lthat the iio Cil

. spider.

Cil

fulerum pointand the power are at the ends with the resista-nce locatedbetween the two.

i lThe mainlever andthe complementary lever which support the platformspider are proportionedsoI that the platform is maintained in ahorizontal position; lIn other words, when a loadis placed upon theplatform, both levers are rocked upon their fulcrum points, and thepoints 19 andv 16' (Fig. 9;) move downwardly inV the rsame degree. rhisis Vaccomplished by making the lever armsA', VB, C, and D proportionate,as follows: AzBzzCz/D; f The design or general` outline of a countescale, such as shown in Fig. v1, is pretty well limited and defined,and/the arrangement of the levers, as shown, fits nicely into the baseof such a scale. However, if the levers are to be used withl a differenttype of scale, or with a scale of different design or outline, thelevers could be arranged so that the arms A a-nd C are shorter than thearms B andkD. They'are greater, asi shown in the drawings,

It will be understood, of course, that when aloadis placed on theplatform, the platform moves downwardlyyand the two levers are rocked onthe pivot points until such a time as the resistance offered through theresistance lever balances the load. This resistance may be supplied by aspring which may be positioned in the drum .of the scale, or it may beprovided by a pendulum. Again, the levers may be used with` a gravityscale.

As shown in the drawings, the platform is supported to one side of acenter line of the The position of the platform with respect to thespider may be varied somewhat to fit the requirements of themore or lessstandard form of scales, although it is important that the platform bepositioned so that the load commimicated through the complementary leveris sufficient to raise the main lever against its fulcrum point.

I claim:

l. In a scale, a load receiving member, a lever for supporting one sideof said member, and a single second lever for supporting the other sideof said member, these two levers being connected together whereby theload is divided and communicated to opposite ends of the first mentionedlever.

2. In a scale, a load receiving member, a lever for supporting one sideof said member, and a second lever extending in the same direction asthe first mentioned lever for supporting the other side of said member,these two levers being connected together whereby the load is dividedand communicated to opposite ends of the first mentioned lever, onedivision of the load exerting a downward force, and the other divisionof the load exerting an upward force on the said lever.

3. In a scale, a spider for supporting a platform, a main lever, and acomplementary lever extending in the same direction as the firstmentioned.v lever connected toy themain lever, the spider beingsupported. at one side by the main lever and at the other side by thecomplementary lever, the connections being such that the load on theplatformisdivided and communicated to opposite endsof the said mainlever.

4. In Va scale, a spider for supporting platform, a main lever, acomplement-ary lever connected to the main.- lever, the spider 'beingsupported at one side by. 'the-main. lever, and at the other side by thecomplementary lever, the connections being such that .the load on theplatform is divided and communicated' to opposite ends of the mainlever, one division of the load exerting an. upward force, and the otherdivision of the loadf exerting a downward force, and a resistance-leverconnected to the said mainlever.

5. In a scale,'means for receiving a load, a lever having one endconnected to one side of said means for supporting the same, a secondlever for supporting the other side'of said means, this second levervbeing positioned above the first and connected theretoy at one i endopposite that which supports Vthe load receiving means, whereby the loadexerts an upward force on this end and a downward force on the firstmentioned end, and a resistance lever which exerts an upward force onthe said rst mentioned lever whereby this lever is lifted against aninverted pivot.

6. In a scale, a load receiving means, a lever, one end of whichdirectly supports part of the load and the other end of which indirectlysupports part of the load, a resistance means for overcoming the load,and an inverted pivot for said lever.

7. In a. scale, a load receiving means, a lever, one end of whichdirectly supports part of the load and the other end of which indirectlysupports part of the load, a resistance means acting on the said lever,that part of the load which is indirectly carried by the lever exertingan upward force, and the resistance means exerting an upward force, andan inverted pivot for the said lever.

8. In a scale, a load receiving means, a lever, one end of whichdirectly supports part of the load and the other end of which indirectlysupports part of the load, a resistance means connected to the saidlever, that part of the load which is indirectly carried by the leverexerting an upward force, and the resistance means exerting an upwardforce, and an inverted pivot for the said lever which is positionedbetween the two upward forces.

9. In a scale, a lever, a load receiving means, a direct connectionbetween the load receiving means and one end of thelever, an indirectconnect-ion between the load receiving means and the other end of thelever, whereby the load exerts a downward force on one end of the leverand an upward force on ,the opposite end of the lever,rand means eX-erting a resistancel on the fsaidlever within the points .whereV theload is received.

, 10. In a scale, a lever, a load receiving means, a directrconnectionbetween the load receiving means and one end ofthe lever, an

Y indirect connection betweenfthe load receiving means and the otherendof the lever,

whereby the load exerts a downward force on one end oftlie'lever and an'upward force ,on thev opposite end of .the lever,-1neans ex erting aresistance on t-he said lever, .and an Y inverted pivot forthesaid'lever.

11.1Inja scale, a lever, a-load receiving means, adirect rconneetionbetween the load receiving `nieansand one end ofy the lever, an

Y Vindirect connection between the load receiving means andthe other endof the lever,

i Awhereby the loadexerts a downward force on one end of the lever andan upward force o n the opposite end of the lever, means exerting aresistance on the said lever whereby the said leverV is bodily lifted,and an inverted pivot for the said lever. v

l2. lA'leverjsystem comprising in eombination, a lever of the irstorder, and a complethe same direction as the tirst lever, one end of one.leverl being connected to Vone end of the other lever, and the oppositeends of the levers being arranged tojsupporta load.

13. A lever system comprising invcombina- `mentary lever ofthe iirs'torder extending in tion, a load receiving means, av lever of the Y firstorder, and acomplementary lever of the firstv order extending inthesame'direction as the firstA lever, one end of one lever beingconnected to one end ofthe other lever, the

opposite endslof the levers being. arranged to e support the loadreceiving means. 14. A lever systemromprisingfin combination, a loadreceiving means, a lever having an inverted pivot disposed between itstwo ends .and having one of its ends arranged to partially support theload receiving means, anda second lever Shaving a pivot'disposed betweenits two ends, one end of the secondV Vmentioned lever being connected toone end

